Books by Delaware Riverasin Commission:
Books in the extended shelves:
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Delaware Riverasin Commission: Simulation of streamflow and water quality in the Brandywine Creek subbasin of the Christina River basin, Pennsylvania and Delaware, 1994-98 (U.S. Dept. of the Interior, U.S. Geological Survey ;, 2003), also by Lisa A. Senior, Edward H. Koerkle, Pennsylvania. Department of Environmental Protection, Delaware. Department of Natural Resources and Environmental Control, and Geological Survey (U.S.) (page images at HathiTrust)
Find more by Delaware Riverasin Commission at your library, or elsewhere.